R&S®NRPM OTA power measurement solution

Key facts

Frequency range from 18 GHz to 90 GHz
Extremely fast RX list mode
For 5G, WLAN IEEE 802.11ad and IEEE 802.11ay as well as automotive radar
Fully calibrated antenna module with integrated diode detector
Scalable to customer requirements

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Designed for extremely accurate over-the-air (OTA) power measurements

The R&S®NRPM is a fully calibrated and individually scalable OTA power measurement solution for benchtop applications or in anechoic chambers. Covering a frequency range from 18 GHz to 90 GHz, it is perfect for over-the-air (OTA) beamforming verification in 5G, WLAN IEEE 802.11ad and IEEE 802.11ay and the calibration of transmit antenna output power.

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Features & benefits

Specified system uncertainty

Fully calibrated OTA power measurement system with specified system uncertainty

With conventional OTA systems, measurement uncertainty comes from frequency-dependent antenna gain, antenna patterns and mismatched RF components. By measuring power directly at the antenna, the R&S®NRPM solution avoids this problem because it does not need any additional RF components. Moreover, the antenna gain, antenna pattern and diode detector are calibrated together. The user does not need to make any complicated system calibrations.

Low-reflection antenna module

Low radar cross section avoids disturbing reflections

The R&S®NRPM-A90 and -A90D antenna modules have a very low radar cross section of typically < –26 dB/sm, putting them about 15 dB/sm below the value of a typical horn antenna. This makes them ideal for screened environments, due to the virtual absence of reflections.

**R&S®NRPM-A90 low-reflection antenna module**

Very high sensitivity

The R&S®NRPM OTA power measurement solution uses a highly sensitive diode detector integrated directly on the antenna

The R&S®NRPM-A90 and R&S®NRPM-A90D antenna modules can measure power down to -76 dBm. For example, a DUT with a transmit power of -10 dBm can be positioned at a distance of 1 m, and the received power at the antenna module can still be precisely determined.

**OTA power measurement solution, benchtop**

System calibration for OTA receiver tests

To test the DUT receiver, it is necessary to know the exact OTA transmitted power at the DUT. To calibrate this measurement setup, the R&S®NRPM-A90 antenna module is positioned at the DUT for the transmit power calibration of the signal generator. The calibration uses an R&S®NRPM-A90/A90D antenna module, which is later replaced with the DUT. The receive power of the DUT is precisely detected.

TX beamforming verification

Multiple R&S®NRPM-A90/A90D antenna modules are needed to test the beamforming function. If the antenna beam is directed at a specific antenna module, this module shows the highest power for all the antennas. Three antenna modules – arranged in a plane – are used to verify whether beamsteering in the horizontal plane properly functions. To test vertical beamforming, the R&S®NRPM-A90/A90D antenna modules must be arranged on at least two horizontal planes.

Specifications

R&S®NRPM-A90 single polarized antenna
Frequency range		18 GHz to 90 GHz
Power measurement range (frequency dependent)	continuous average	-76 dBm to -19 dBm
	trace	-63 dBm to -19 dBm
Rise/fall time		2.2 μs
Video bandwidth		220 kHz
Measurement uncertainty
18 GHz to 24 GHz	absolute	0.68 dB to 0.81 dB
	relative	0.05 dB to 0.09 dB
> 24 GHz to 35 GHz	absolute	0.49 dB to 0.66 dB
	relative	0.05 dB to 0.09 dB
> 35 GHz to 57 GHz	absolute	0.50 dB to 0.72 dB
	relative	0.05 dB to 0.09 dB
> 57 GHz to 71 GHz	absolute	0.58 dB to 0.83 dB
	relative	0.05 dB to 0.09 dB
> 71 GHz to 81 GHz	absolute	0.61 dB to 0.91 dB
	relative	0.05 dB to 0.09 dB
> 81 GHz to 90 GHz	absolute	0.69 dB to 0.97 dB
	relative	0.05 dB to 0.09 dB
R&S®NRPM-A90D dual polarized antenna
Frequency range		18 GHz to 90 GHz
Power measurement range (frequency dependent)	continuous average	-76 dBm to -19 dBm
	trace	-63 dBm to -19 dBm
Rise/fall time		2.2 μs
Video bandwidth		220 kHz
Measurement uncertainty (measurement distance 1 m)
18 GHz to 24 GHz	absolute	0.73 dB to 0.85 dB
	relative	0.05 dB to 0.09 dB
> 24 GHz to 35 GHz	absolute	0.55 dB to 0.71 dB
	relative	0.05 dB to 0.09 dB
> 35 GHz to 57 GHz	absolute	0.59 dB to 0.78 dB
	relative	0.05 dB to 0.09 dB
> 57 GHz to 71 GHz	absolute	0.68 dB to 0.90 dB
	relative	0.05 dB to 0.09 dB
> 71 GHz to 81 GHz	absolute	0.72 dB to 0.99 dB
	relative	0.05 dB to 0.09 dB
> 81 GHz to 90 GHz	absolute	0.87 dB to 1.10 dB
	relative	0.05 dB to 0.09 dB

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Related videos

6:23

Understanding OTA Power Measurements

This video provides a brief technical introduction to over-the-air (OTA) power measurements, how they are different from traditional conducted power measurements.

18-May-2020

7:27

Using the R&S®NRPM

This short video provides an brief introduction to the R&S®NRPM over-the-air (OTA) power measurement system.

18-May-2020

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